diff --git a/msdos/dpmi.c b/msdos/dpmi.c
index 2ace8b7ec29..f2f01c39147 100644
--- a/msdos/dpmi.c
+++ b/msdos/dpmi.c
@@ -14,6 +14,7 @@
 #include "miscemu.h"
 #include "msdos.h"
 #include "task.h"
+#include "thread.h"
 #include "toolhelp.h"
 #include "selectors.h"
 #include "process.h"